This is an OLD video. Iirc it was a concept from Magpul called the FMG and they only made like 2 or 3 of them. I think recently some Swiss company is making something similar. Found it.

is right. Some more info.

https://newatlas.com/the-magpul-fmg9-netbook-sized-folding-machine-gun/10662/

Again, never made for production/sale.

However, it looks like that may have changed last year. https://www.ammoland.com/2021/01/magpul-unveils-civilian-legal-version-of-fmg-9-the-fdp-9/